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Today, we present a case study with updated content in February.

[JAC279] Thermal Analysis Accounting for Cooling of the IPM Motor


EV/HEV traction motors operate at ranges such as high torque and high power ranges. When running at such operating points, the temperature of parts rises as the loss becomes the heat source. Cooling system design using water jackets and ATF is put into practice as normal cooling by air allows the parts to exceed their heat resistant temperature.

It is possible to run an analysis that takes into account the cooling and the heat resistance between the parts by using the thermal equivalent circuit.
In this example, thermal equivalent circuit is used to run thermal analysis of a 3-phase IPM motor that accounts for cooling to the temperature change in the coil.

Cooling Specifications

Cooling specifications are shown in Fig. 1.
The water jacket is installed on the upper 90 deg sector of the stator.
Assume that oil in the ATF pool accumulates inside the lower 90 deg sector of stator.
Housing, coil end and shafts are modeled in the thermal equivalent circuit.

Please see the website for “Thermal Equivalent Circuit” and “Temperature Change in Coil”.

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Sample data is available to JMAG proper users and requires license ID to access.
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